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Дата изменения: Unknown Дата индексирования: Tue Oct 2 10:13:03 2012 Кодировка: Поисковые слова: active galaxy |
Redshift vs. Time:
where z is the redshift, t the cosmic time, H0 is Hubble's constant, and the current density of the universe, in units of
Angular Size:
where is the angle subtended on Earth by an object of proper length d at redshift z. D is given by the expression
Flux:
where S is the energy received per second per square metre on earth, and L is the luminosity emitted by the object at redshift z in a second (object frame).